1.窗体启动:
Control.HandleCreated
Control.BindingContextChanged
Form.Load
Control.VisibleChanged
Form.Activated
Form.Shown
2.窗体关闭:
Form.Closing
Form.FormClosing
Form.Closed
Form.FormClosed
Form.Deactivate
3.控件焦点与验证事件:
Enter
GotFocus
Leave
Validating
Validated
LostFocus
4.鼠标周期:
Enter
GotFocus
LostFocus
Leave
Validating
Validated
原文：https://www.cnblogs.com/asdyzh/p/9899986.html